| 年份 | 博茨瓦纳 |
|---|---|
| 2023 | - |
| 2022 | -0.757739 |
| 2021 | -0.7364 |
| 2020 | -0.540884 |
| 2019 | -0.454031 |
| 2018 | -0.369408 |
| 2017 | -0.341672 |
| 2016 | -0.368381 |
| 2015 | -0.405578 |
| 2014 | -0.414027 |
| 2013 | -0.402926 |
| 2012 | -0.609791 |
| 2011 | -1.93681 |
| 2010 | -1.78813 |
| 2009 | -1.69581 |
| 2008 | -1.63962 |
| 2007 | -1.60247 |
| 2006 | 0.838309 |
| 2005 | 0.767905 |
| 2004 | 0.722469 |
| 2003 | 0.7368 |
| 2002 | 0.75487 |
| 2001 | 0.184753 |
| 2000 | 0.278392 |
| 1999 | 0.379915 |
| 1998 | 0.485352 |
| 1997 | 0.620415 |
| 1996 | 0.787573 |
| 1995 | 0.983043 |
| 1994 | 1.16416 |
| 1993 | 1.29727 |
| 1992 | 0.737651 |
| 1991 | -3.08502 |
| 1990 | -2.49095 |
| 1989 | -1.90215 |
| 1988 | -1.34422 |
| 1987 | -0.800351 |
| 1986 | -0.33806 |
| 1985 | 0.0666572 |
| 1984 | 0.425927 |
| 1983 | 0.8056 |
| 1982 | 1.63785 |
| 1981 | 3.30548 |
| 1980 | 3.70574 |
| 1979 | 3.92392 |
| 1978 | 4.05725 |
| 1977 | 4.15663 |
| 1976 | 4.21697 |
| 1975 | 4.24962 |
| 1974 | 4.27379 |
| 1973 | 4.01225 |
| 1972 | 2.88162 |
| 1971 | 0.717583 |
| 1970 | -0.170598 |
| 1969 | -0.260825 |
| 1968 | -0.156934 |
| 1967 | -0.0509824 |
| 1966 | 0.0535322 |
| 1965 | 0.995182 |
| 1964 | 2.22972 |
| 1963 | 2.28596 |
| 1962 | 2.22898 |
| 1961 | 2.18663 |
| 1960 | - |